Alarm system.



L. A. NORTHRUP.

ALARM SYSTEM.

APPLICATION FILED 001214, 1912. 1,121,124 Patented Dec. 15,1914.

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ALARM SYSTEM.

APPLIUATION FILED 00114.1912.

1 2 1 1 24. Patented Dec. 15. 1914.

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LEON A. NORTHBUP, OF SAN FLANCISCO. CALIFORNIA.

ALARM SYSTEM.

l Application filed October 14, 1912.

1 u all w/I am it may concern:

lie it known that 1, Leo): A. NORTHRUP, a citizen of the United States, residing at the city and county of San Francisco and State of California, have invented new and useful Improvements in Alarm Systems, of which the following is a specification.

This invention relates to an alarm or signal apparatus.

It is the object of'this invention to provide an apparatus for giving a signal to denote that unauthorized entrance has been made to buildings, vaults, cabinets or other inclosed structures, and which is particularly adapted for use as a burglar alarm.

Another object is to provide a device of the above character which is simple in construction, efiicient and reliable in operation, and inexpensive to install.

.A further object is to provide an alarm system in which the electric current is employed in blowing a whistle and producing a light, thus giving a signal which can be recognized by the sense of sight and the sense of hearing.

Other objects will appear hereinafter.

The invention primarily resides in disposing a whistle and an electric light at any convenient point, providing means operated by a motor for creating a current of air to sound the whistle, with means controlled by the motor for flashing the light intermittently, and in providing electrical connections whereby the opening of a door, window, or other closure will act to set the motor in operation and thereby turn on the light and blow the whistle.

The invention further consists of the parts and the. construction and combination of parts as hereinafter more fully described and claimed, having reference to the accom panying drawings, in which Figure 1 is 'a longitudinal section of the invention showing the electrical connections in.diagram. Fig. 2 is a transverse section of the invention partly in elevation.

In the drawings A represents a case or cabinet of any suitable construction in which a crank shaft 2 is revolubly mounted. A wheel 3 is m unted on the crank shaft 2 and is'connected y means of a belt or chain 1 to a driving wheel 5 on the shaft 6 of an electric motor 7, of any suitable description; the crank shaft 2 being designed to be driven from the motor. 7 when the latter. is in opera- Specification of Letters Patent.

PatentedDee. 15,1914.

Serial No. 725,642. 1

tion'. Connected to the crank of the crank shaft is a series of pitman rods 8, the outer ends of which connect to bellows 9 of any suitable construction mounted on the interior of the case A.

The bellows 9 are fitted with the usual valved inlet openings 10 and valved outlet openings 11; the latter leading to a continuous passage 12 formed in the case A and communicating with each of the bellows 9. Connecting with the passage 12 is a conduit or pipe 13 which leads to one or more whistles l-lof any suitable description, disposed at any convenient point.

Mounted on the crank shaft 2 is a cam 15 which is designed, when the cam is rotated, to actuate an arm 16 pivoted at 17, and normally held in contact with the outer face of the cam by means of a spring 18. The arm 16 is formed with a contact member 19 on its outer end which is adapted to be thrown in and out of contact with a contact member '20 on an arm 21 when the cam 15 is rotated to make and break an electrical circuit leading from a battery B to one or more electric lights 22 disposed at any convenient point.

The arm 21 is pivoted at 23 and has its movement toward the arm 16 limited by means of a stop 24:; a spring 25 acting to hold the arm 21 in its normal position in which the contact member 20 will be spaced :1 short distance from the contact member 1!). This construction admits of the arm 21 moving upward in unison with the arm 16 when the latter is brought in contact therewith, thereby insuring a close connection between the contact members 19 and 20.

The arms 16 and 2], and the contact members 19 and 20 form a switch which is adapted to be actuated by the cam 15 to alternately make and break the circuit to the lights 22, thereby causing the latter to flash intermittently. The arm 2-1 is connected to one pole of the battery B by means of a conductor a, while the arm 16 is connected to the other pole of the battery 13 by means of a conductor 7), to which the lights 22 are connected; the conductors a and b forming the lighting circuit which is in parallel with the motor circuit.

The current for operating the motor 7 is delivered thereto from the battery B by means of the conductors a and b; the conductor 6 connecting with a normally open switch for breaking the circuit to the motor 7. This switch ,is here shown as consisting of a pair of spaced spring contact members 26 and 26, and an arm 27 pivoted at 28, carrying a contact piece 29 which is adapted to form an electrical connection between the contact members 26 and 26' when the arm 27 is swung, as will be later described, to throw the contact piece 29 into contact with the spring members 26 and 26.

The arm 27 is normallyiretained in such position as to dispose the contact piece 29 out of engagement with the spring contact members 26 and 26 by means of a spring 30, which holds the arm 27 against a stop 31v for preventing its outward movement. The arm 27 is designed to be actuated to completevthe circuit through members 26 and 26 and thereby throw the motor 7 into operation by means of a magnet 32 having a core so arranged that when the magnet is energized the arm 27 will be rocked on its pivot 28 in opposition to the spring 30,

thereby moving the contact piece 29 into engagement with the spring members 26 and 26.

One terminal of the magnet 32 connects ,with a conductor e, while the other terminal connects with a conductor f leading to one terminal of the battery B. The con ductor e leads to one side of a normally open switch 33, the other side of which connects with a conductor 9 leading to the other terminal of the battery B.

The switch 33 is designed to be so disposed in relation to the door, window, or other closure as to be operated by the opening thereof to complete a circuit from the battery B through conductor f, magnet 32, conductor 6, switch 33, and conductor g, and

thereby energize the magnet 32. Any num-' ber of switches 33 may be disposed between the conductors e and g, and they may be positioned at any convenient point, and may be of any suitable construction.

Means are provided for automatically locking the arm 27 "'1 its innermost circuitmaking position sothat a continuous circuit.

through the motor 7 will take place after the switch 33 is thrown out. This means consists of a horizontally disposed arm 34: pivoted at 35 on the outer end of which an upwardly extending flange 36 is formed, which flange is adapted to engage the lower end of the arm 27 when the latter is in its innermost position, as will presently be described. A spring 37 normally retains the arm 34 in its uppermost position; an outwardly extending flange 38 on the flan e 36 normally contacting the lower end 0 the arm 27 when the latter is in its outermost position to limit the upward movement of the arm 34. This arm 34 is designed to be moved in a downward direction by means of a magnet 39, the core of which, when energized, acts to move the arm 34 downward in opposition to the spring 37. One terminal of the magnet 39 connects with the con-- ductor Z) leading to one pole of the battery B by means of a conductor h, the other terminal of the magnet 39 being connected to the conductor g by means of a conductor The conductor z" is normally broken by means of a switch .0 disposed at any conrenient point.

In the operation of the invention, when any one of the switches 33 is operated'by the opening of the closure to which itis attached, the magnet 32 becomes energized, thereby attracting the arm 27 and moving it so as to dispose the contacting piece 29 in engagement with the contact members 26 and 26, thereby completing a circuit from the battery B through the conductors c and b to the motor 7, setting the latter in operatio n.

The arm 27 on being moved to its innermost position, as indicated by dotted l nes in Fig. l, is locked in this ,position by means of the arm 34, which is moved upward by the action of the spring 37 when the lower end of the arm 27 passes beyond the inner face of the flange 36; the flange 36 preventing the backward movement of the arm 27 when the magnet 32 is deenergized.

- The motor 7 on being set in motion drives the crank shaft 2 by means of the wheels 3 and 5 and thechain or belt 4. The crank shaft 2 on rotating actuates the bellows 9 by means of the pitman rods 8 insuch manner as to pump a current of air through the passage 12 and pipe 13, out through the whistle 14, thereby sounding the latter.

It will be seen that the whistle M will be blown continuously as long as the motor 7 is in operation. It may, however, be blown intermittently by employing, a single bellow's' i 9 instead of a series, as", 'loavn. The crank shaft 2 on rotating cause the cam 15 to actuate the arm 16 and intermittently throw the contact member 19 in and out of aenga gement with the Contact; member 21, thereby causing a current t d intermittentlyJfiow. through the lamp circuit3a-b to repeatedly flash the lights 22.

From the foregoing it will be as long as the contact piece 29 closes the ci cuit between the contact members 26 tnd'ze the motor 7 will be operated by the current from the battery B, thereby sounding th j g ro whistle 14 and lighting the lights 22. it is desired to stop the motor 7 and rest the parts to their normal position, th e swit h' f tion in opposition to the spring 37. The arm flit?) seen ii i go 1 the conductors f and h, magnet 39, onducgfr 1,181,12et a Bet in moving downward moves the flange 36 below the lower end of the arm 27, whereupon the sprlng 30 Wlll act to move arm 27 to its normal position, as shown in full lines in Fig. 1, thereby Withdrawing the contact piece 29 from between the contact members 26 and 26, thus breaking the circuit from the battery B to the motor 7. The switch a is then opened to break the flow of current through the magnet 39, thereby deenergizing the latter and allowing the spring 3?. to restore the arm 3i in its normal position with the [hinge 38 abutting against the lower end of the arm 27.

lt is manifest that any means for creating a current of air by the rotation of a crank shait may be employed ifdesired, and that any switch mechanism for controlling the lights "22 from the motor 7 may be used.

The battery 13 may be disposed. in the case or cabinet A thus making the apparatus self contained; it being obvious however, that any suitable source of electric supply may be employed as the occasion may require.

By arranging the lights 22 in parallel with the motor 7, the current thereto will be cut off when the switch 27 is thrown out to stop the motor, thus preventing the light from burning in event the cam stops in an inner wall concentrically located Within I said outer casing to provide a passageway thercbetween, a plurality of pressure producing devices having valve connections with said passageway, means centrally locatedwithin the casing for actuating said device, and means controlled by said actuating means for intermittently operating said visual signal, all of said parts being automatically set into operation by the opening of a closure In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LEON A. NORTHRUP. Witnesses:

JOHN H. HERRING, W. W. HEALEY. 

